Knife for pile-fabric looms



Patented Jan. 30, 1923.

THEODOR BACHOFEN, OF WEST HOBOKEN, NEW JERSEY.

KNIFE FOR PILErFABRIC LOOMS.

Application filed February 23, 1922. Serial No. 538,466.

To all whom t may concern:

. Be it known that I, THEoDoR BACHOFEN, a citizen of the United States, residin in Vest Hoboken, in the county of Hu son and State of New Jersey, have invented certain new and useful Improvements in Knives for Pile-Fabric Looms, of which the following is a specification.

This invention relates to devices used in the production of cut pile fabrics, and includes improvements on my patent on woven-in knife for pile fabric looms, is-v sued June 6, 1922 and numbered 1,418,512.

IOne of the present purposes is in the provision of an improved knife from which the cutting blade. may be easily and instantly removed without loosening or in any way interfering with its holder or others in the series.

Another object is to provide a form of cutter blade that can be sharpened to a keen cutting edge in a more convenient and posit-ive manner, and whichl can be more economically made. l

A further aim is to produce knife blade holders adapted to protect the points of the blades, which are interchangeably held therein, the holder being permanently but removably engaged by its supports in such manner as to dispense with spacing devices of .any kind.

Still another purpose is to provide a blade so shaped as to automatically become firmly seated in its holder, its operative action tending to retain the blade in proper position,

These several objects are secured bythe Y novel design and construction of parts hereafter described in their preferred embodiments and-illustrated in the annexed drawing, constituting an essential part of this disclosure, and in which:

Figure 1 is a plan view showing a, fragmentary portion of the knife series as used in cutting a pile fabric.

Figure 2 is an enlarged longitudinal seotional view of one of the knives, the section being taken on line 2 2 of Figure 1.

Figure 3 is a. transverse sectional view of a knife and its support, taken substantially on line 3-3 of Figure 2. y

lFigure 4 is a side view of the cutter blade in detail.

Figure 5 is a perspective view of the knife holder.

Figure 6 is a. longitudinal sectional view, similar to Figure 2, but illustrating a modification in construction' of both the blade and holder.

As is well-known in the art, the purpose of the knives is to sever theloosely twisted threads of the filler weft, constituting the pile or upper layer of the fabricas it is Woven.

This is accomplished by mounting the knives on support rods 10 and 11, respec- `tively front and rear, the same being arranged in parallel spaced relation, adjacent the breast of the loom, to clear the reed land also to permit free passage of the shuttles beyond their frontends.

The knives are held against the advancing fabric, as it is woven, just over the base or groundv portion, by wires 12, actuated by the loom harness in a manner well understood.

i In the present invention each of the knives consist of a holder formed from a single symmetrical sheet metal blank bent to produce two equal sides 14 between which is a uniform narrow space, constituting a U- shaped socket 15, having a bottom or base 16 formed by the bight of the bent material.

Both sides are pierced by round openings 17 and 18 suited to slide on the rods 10 and 11, and attheextreme front the base 16 has a fiat extension 19, its width being equal to the full thickness of the holder. K

Said extension contains a small hole 20, near its point, to receive the wire 12, woven into thefabric as it: is made and leading from the harness, directly below and in proximity to the base, the wire'beinggiven a. sharp bend, as at 13, in passing through the hole 20, so as to positively engage the holder, but permit removalwhen desired.

As shown in Figures 2 and 4, the upper edges of the sides 14 are straight and parallel, as V'at 21, over half the length of the holder from its rear end, and then are joined b-y diagonal edges 22Lextending-to the front, at an angle' of substantially thirty degrees with reference to the base, to points about one fourth the full widthv of the sides and then blend into convex curves 23 ofrela.-

tively long radii, the same terminating at 24 ion Referring nowto Figure 4, the blade 25 as shown consists of a thin plate of sheet steel, such for instance as razor blades are made of, the same fitting the socket 15 so snugly as to require but slight force to seat and unseat.

The rear portion of the blade is essentially rectangular, its width being preferably slightly in excess of the depth of the socket so 'that its upper edge is above the edges 21 for convenience in grasping when it is desired to remove the blade.`

The extending front portion of the blade -is shaped at an angle of approximately thirty degrees from the lower edge, 1n conformity with the angle 22, and this angular edge 26 is beveled, as at 27, on both sides its entire length, to produce a keen razor-like edge capable of being readily sharpened by methods usually employed for such purposes.

Extending into the body,Y of the blade, from its lower edge, is an open diagonal slot or recess 28, suited to freely engage the rod 11, the angle of the recess being inclined towards the front of the blade, so that any pressure'applied to the edge 26 tends to seat the blade firmly on the inner face of the socket element 16, proper clearance being provided at the end of the recess for the rod.

When assembled, as shown in Figure 2, the edge 26 is in advance of the holder edges 22 and the extreme point 26 of the-,blade is protected by the elements 24 which serve to raise the advancing threads and guide them on to the blade, acting as guards to effectually prevent threads from getting under the point of the knife when in operation, the curved edge 23 of the holder serving to direct the threads as the fabric is moved against the knives,

In the modification shown in Figure 6,

Q the rear portion of the blade 25 is extended,

as at 25 its rear edge being cutl away to produce a'shoulder 29 to rest upon the rod- 10, below which the ledge 30 is cut atan angle corresponding to the angle of the recess 28.

The blade in this form vmay restv on the rods 10 and 11, its lower edge clearing the base 16, lor the slot 28 and shoulder 29 may clear the rods and rest on the base as preferred.

Obviously the cut-outs 21 may be made 1n any or all the holders and the blades in either of the types so shown.

As the openings 17-18 in the sideshof the holders are enclosed and suited to the rods, no spacersy are required, the knives assuming the properV distance apart and acting'as a unit under the pull of the wires 12. r

It will be apparent, however, that any selected blade may be removed from its holder by grasping its extending upper edge and imparting a combined upward and forward movement, the holder remaining permanently on the rods ready to recelve the same or another blade.

`While in the foregoing, there has been described preferred embodiments of the invention, it is to be understood that changes in the proportion, minor details of construc- Y knife blade frictionally engaged in said.

holder having an oblique cutting edge extending in advance of the holder, support rods passing transversely through said holder, and an open inclined recess in said blade engageable with one of said rods.

2. A knife of the type described comprising a substantially U shaped holder having an oblique end, a longitudinal pile wire knife blade frictionally engaged in said holder having an oblique cutting edge in advance .of said holder, said holder having spaced openings through its sides, support rods engaged by the openings, said blade having an angularly disposed recess engageable with one of said rods, and a seat in the bottom of said holder on which the lower edge of said knife normally rests.

3. A knife of the type described comprisn ing a unitary holder having a U shaped cross adapted to properly locate said blade there.

4l. A knife ofthe type described comprlsing a'unitary holder formed of sheet ymaterial in U shaped cross section, said holder having its front end'extended obliquely' downward to its base, a Hat .ex-

tension in register with the base, said eX.-`

tension having a longitudinal pile wire knife perforation, a blade frictionally engaged between the walls of said holder and having a keen oblique advance edge projecting beyond the corresponding oblique edges'of`- saidv socket, guards .formed on the holder walls adaptedV to guidev material onto the cutting edge of said blade, and means for maintaining4 said blade in position when adjusted in' said socket.

5. .A device of the lassdescribed comprising a pair of support rods, a plurality of knife holders having transverse openings suited to slidably engage said rods, the sides of said holders indi-ning obliquely Hdown ward at their advance ends, longitudinal pile Wire knife blades fricti'onally engaged in said holders, said blades being shaped to lpresent their cutting edges outwardly beyond the edges of said holders, guard eXtensions on said holders adapted to guide material onto the cutting edges of said blades 10 above the points thereof, means formed with said holders for engaging longitudinal pile Wires, and mea-ns formed in said knives adapted to removably engage said bars.

In witness whereof I name to this application.

THEoDoR BAoHoFEN.

have signed my 15 

